WPF XML DataBinding

Question

我试图做一些WPF数据绑定，但我现在有点挂了。我有两个列表框和一个XML文件。第一个列表框成功绑定到XML源。但是，当我尝试绑定到第一个列表框中选定项目的子项作为第二个列表框的源时，不显示任何内容。目标就像索引或查找（选择一个索引导致查找相关项目）。我在这里错过了数据绑定的东西吗？下面的XAML和XML。

XAML：

<Window x:Class="MyTool.Window1" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Title="Window1" Height="600" Width="800"> 
    <Window.Resources> 
     <XmlDataProvider x:Key="AllDeployments" XPath="Deployments" Source="Deployments.xml" /> 
     <DataTemplate x:Key="dtDeployments"> 
      <StackPanel FlowDirection="LeftToRight" Orientation="Horizontal"> 
       <TextBlock Text="{Binding XPath=@Name}" /> 
       <TextBlock Text=" - "/> 
       <TextBlock Text="{Binding XPath=@Date}" /> 
      </StackPanel> 
     </DataTemplate> 
     <DataTemplate x:Key="dtFiles"> 
      <TextBlock Text="{Binding XPath=File}" /> 
     </DataTemplate> 
    </Window.Resources> 
    <Grid Name="gMain"> 
     <Grid.ColumnDefinitions> 
      <ColumnDefinition /> 
      <ColumnDefinition Width="2"/> 
      <ColumnDefinition /> 
     </Grid.ColumnDefinitions> 
     <Menu Grid.Column="0" Grid.ColumnSpan="3"></Menu> 
     <ListBox Grid.Column="0" Name="lbDeployment" 
       ItemsSource="{Binding Source={StaticResource AllDeployments}, XPath=Deployment}" 
       ItemTemplate="{StaticResource dtDeployments}"></ListBox> 
     <GridSplitter Grid.Column="1"></GridSplitter> 
     <StackPanel Grid.Column="2"> 
      <ListBox Name="lbFiles" 
        ItemsSource="{Binding Mode=TwoWay, ElementName=lbDeployments, Path=SelectedItem.InnerText, UpdateSourceTrigger=PropertyChanged}" 
        ItemTemplate="{StaticResource dtFiles}" 
        Height="400"></ListBox> 
     </StackPanel> 
    </Grid> 
</Window> 

XML：

<?xml version="1.0" encoding="utf-8"?> 
<Deployments MostRecentDate="12/31/2009 8:41:13 PM"> 
    <Filters> 
     <Filter>.cs</Filter> 
     <Filter>.csproj</Filter> 
    </Filters> 
    <Deployment Name="First Deployment" ID="1" Date="6/29/2009 8:41:13 PM"> 
     <File>file1.cs</File> 
     <File>file2.cs</File> 
    </Deployment> 
    <Deployment Name="First Deployment" ID="1" Date="6/29/2009 8:41:13 PM"> 
     <File>file1.cs</File> 
     <File>file2.cs</File> 
    </Deployment> 
    <Deployment Name="First Deployment" ID="1" Date="6/29/2009 8:41:13 PM"> 
     <File>file1.cs</File> 
     <File>file2.cs</File> 
    </Deployment> 
    <Deployment Name="First Deployment" ID="1" Date="6/29/2009 8:41:13 PM"> 
     <File>file1.cs</File> 
     <File>file2.cs</File> 
    </Deployment> 
    <Deployment Name="First Deployment" ID="1" Date="6/29/2009 8:41:13 PM"> 
     <File>file1.cs</File> 
     <File>file2.cs</File> 
    </Deployment> 
</Deployments> 

Answer 1

数据绑定是艰难的，因为他们往往会默默地消失，这使得它们很难调试。您在代码中遇到的头号问题是lbFiles列表框中的ElementName拼写错误。拼错会让你每一次！在纠正拼写错误，删除绑定的innerText部分和删除ItemTemplate之后，我能够获得文件名。我不确定为什么ItemTemplate不起作用，但希望这个例子能让你再次移动。

<Window x:Class="WpfApplication1.Window1" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
Title="Window1" Height="600" Width="800"> 
<Window.Resources> 
    <XmlDataProvider x:Key="AllDeployments" XPath="Deployments" Source="Deployments.xml" /> 
    <DataTemplate x:Key="dtDeployments"> 
     <StackPanel FlowDirection="LeftToRight" Orientation="Horizontal"> 
      <TextBlock Text="{Binding XPath=@Name}" /> 
      <TextBlock Text=" - "/> 
      <TextBlock Text="{Binding XPath=@Date}" /> 
     </StackPanel> 
    </DataTemplate> 
    <DataTemplate x:Key="dtFiles"> 
     <TextBlock Text="{Binding XPath=File}" /> 
    </DataTemplate> 
</Window.Resources> 
<Grid Name="gMain"> 
    <Grid.ColumnDefinitions> 
     <ColumnDefinition /> 
     <ColumnDefinition Width="2"/> 
     <ColumnDefinition /> 
    </Grid.ColumnDefinitions> 
    <Menu Grid.Column="0" Grid.ColumnSpan="3"></Menu> 
    <ListBox Grid.Column="0" Name="lbDeployment" 
      ItemsSource="{Binding Source={StaticResource AllDeployments}, XPath=Deployment}" 
      ItemTemplate="{StaticResource dtDeployments}"></ListBox> 
    <GridSplitter Grid.Column="1"></GridSplitter> 
    <StackPanel Grid.Column="2"> 
     <ListBox Name="lbFiles" 
       ItemsSource="{Binding ElementName=lbDeployment, Path=SelectedItem, UpdateSourceTrigger=PropertyChanged}"      
       Height="400" /> 
    </StackPanel> 
</Grid>